Title:
RESIN FOR FOAM MOLDING AND METHOD FOR PRODUCING THE SAME, AS WELL AS METHOD FOR MANUFACTURING FOAM MOLDING
Document Type and Number:
Japanese Patent JP2023054621
Kind Code:
A
Abstract:
To provide a method for producing a resin for foam molding which has excellent foam moldability, where a polypropylene-based resin having no long-chain branch structure can be used.SOLUTION: A method for producing a resin for foam molding includes a step of melting and kneading a raw material resin 4 containing a polypropylene-based resin and low density polyethylene using an extruder 2, wherein the extruder has a cylinder 2a to which the raw material resin is charged and a screw 2b rotatably arranged in the cylinder; the screw has a central part and a flight part; the central part extends along a rotation axis of the screw; the flight part is provided so as to project to the radial outside from the central part; the flight part has such a shape as to convey the raw material resin toward the tip of the screw along with rotation of the screw; and when a diameter of the flight part in the screw is represented by D, and an area of the flight surface facing the inner surface of the cylinder in the flight part is represented by S, S/D is 800-1,500.SELECTED DRAWING: Figure 1
Inventors:
SANO TAKASHI
Application Number:
JP2021163588A
Publication Date:
April 14, 2023
Filing Date:
October 04, 2021
Export Citation:
Assignee:
KYORAKU CO LTD
International Classes:
C08J9/04; B29C44/00; B29C48/505; B29C49/04; B29C51/10
Attorney, Agent or Firm:
SK Patent Attorney Corporation
Akihiko Okuno
Hiroyuki Ito
Akihiko Okuno
Hiroyuki Ito